When opening a direct link such as https://mysite.net/filerun/index.php/f/29954 on an Android phone, it gives the option to open it using the NextCloud app. Doing this, however, causes the app to show an error saying "Local file does not exist". Opening the link in the browser works fine.
Also, the app doesn't seem to support pagination, which is a bit of an issue in folders with many files.
Customer support service by UserEcho